What do you mean by "universal recruitment"? Adult college entrance examination? When I finally graduated, I only had the seal of the Institute of Adult Education.
Self-taught exams are divided into full-time and part-time systems, that is, you can take exams while working, but you can't pass the exams well, and you often can't get a diploma for many years without hard work.
Generally, the exams for unified recruitment are very easy to pass, and it is easy to get a diploma within the specified time.